Using lexical chains for keyword extraction

Keywords can be considered as condensed versions of documents and short forms of their summaries. In this paper, the problem of automatic extraction of keywords from documents is treated as a supervised learning task. A lexical chain holds a set of semantically related words of a text and it can be said that a lexical chain represents the semantic content of a portion of the text. Although lexical chains have been extensively used in text summarization, their usage for keyword extraction problem has not been fully investigated. In this paper, a keyword extraction technique that uses lexical chains is described, and encouraging results are obtained.     

Authorship attribution based on a probabilistic topic model

This paper describes, evaluates and compares the use of Latent Dirichlet allocation (LDA) as an approach to authorship attribution. Based on this generative probabilistic topic model, we can model each document as a mixture of topic distributions with each topic specifying a distribution over words. Based on author profiles (aggregation of all texts written by the same writer) we suggest computing the distance with a disputed text to determine its possible writer. This distance is based on the difference between the two topic distributions. To evaluate different attribution schemes, we carried out an experiment based on 5408 newspaper articles (Glasgow Herald) written by 20 distinct authors. To complement this experiment, we used 4326 articles extracted from the Italian newspaper La Stampa and written by 20 journalists. This research demonstrates that the LDA-based classification scheme tends to outperform the Delta rule, and the χ² distance, two classical approaches in authorship attribution based on a restricted number of terms. Compared to the Kullback–Leibler divergence, the LDA-based scheme can provide better effectiveness when considering a larger number of terms.     

竞技武术套路中腾空摆莲B 和C 级跳跃落地稳定性的研究 杨乃

竞技武术套路中腾空摆莲B和C级跳跃落地接马步是长拳、南拳武术项目的两个难度动作.通过对该组动作落地技术的动力学及相关稳定性因素的分析,提出合理的落地技术和训练中需解决的问题.采用录像观察与试验分析相结合的方法,针对男女运动员的腾空与落地的特点,提出相应的解决办法和训练理论.     

高校高水平篮球队开展体育赞助的对策研究

通过文献资料法和专家访谈等研究方法,本文从高校以及球队自身、企业、政策、法规体制和人才培养等外部条件及提高高校体育主管部门的体育赞助营销水平等方面提出了自己见解。针对改善我国高校高水平篮球队伍开展体育赞助提出了创建性的建议。     

Investigating the role of the HLTA in supporting learning in English schools

The development of support staff was a key aspect of the Labour government’s reform of the school workforce in England. As part of this strategy approximately 25,000 Teaching Assistants (TAs) gained Higher Level Teaching Assistant (HLTA) status and were deployed in schools in a variety of roles, often operating in a quasi-teaching role. The research re-visits individuals who had acquired HLTA status between 2006 and 2009 and had participated in a questionnaire survey regarding their role at that time. A duplicate questionnaire was distributed in 2013 to 305 of these HLTAs and was followed up in 2014 by focus groups with self-selecting individuals from the original sample. To date there has been little research relating to the development of the HLTA role and the implications this has for both teachers and pupils, particularly in terms of provision for the most vulnerable learners.     

汉语框架网络知识本体构建研究

汉语框架网络知识本体是以框架语义学为理论基础,有丰富的语料库支撑,揭示了概念的本体关系。其获取,是在构建语料库的基础上,利用叙词表、分类表和其他知识分类体系等现有的知识本体,识别领域内外相关的概念并抽取相应属性,建立概念之间的关系,并利用所识别的概念和关系创建新的本体,融合已有的本体和新建本体。图2。参考文献4。     

基层公共图书馆员服务礼仪建设初探

目前，我国中西部地区的基层公共图书馆硬件条件普遍较差，加之图书馆员队伍整体素质不高，致使这些图书馆的读者利用率一直徘徊不前。要打破这种局面，图书馆员服务礼仪建设是一项重要的基础性工作。     

《左传》姓氏名号研究述要

姓氏名号的研究是文化史研究院的重要内容之一 ,要作好这项研究 ,首先必须在各个历史时段 ,选择有代表性的著作进行比较深入细致的调查 ,对《左传》人名中反映的词汇意义、附加意义、人文背景及《左传》的姓与氏等问题进行系统的研究 ,有助于为我国姓氏名号的建立提供有价值的、可靠的素材     

放射性物位计在连续重整装置的应用

催化剂再生系统是连续重整装置反再部分的核心环节。在催化剂再生和循环的过程中需要准确检测催化剂的物位,为控制系统提供可靠参数。放射性物位计就是一种能准确检测设备中催化剂物位的仪表。本文介绍了放射性物位计的工作原理、配置方法和防护事项。同时,结合国产连续重整工艺,介绍了放射性物位计在连续重整中的设置和标定。     

英语写作中语块使用的实证研究

提高英语写作技能是英语教学的目标之一,但怎样提高写作水平是英语教学亟待解决的难题。将语块理论引入写作教学,为其提供了新的视角。采用SPSS17．0对140名学习者在写作中使用语块的数据分析,发现其特征如下：从语块使用频度上看,语块使用较少,仅占全文的1/3;从语块使用重复率上看,其重复率较高,接近语块总数的1/3,这表明学习者语块使用不够多样化,种类不丰富;从语块类型上看,短语语块使用较多,句子语块使用较少;从学习者水平上看,高分组限制语块使用较多,低分组固定语块使用较多。